I'm shooting a 300 WSM with 165 gr Nosler AB over 60 grs of RL-15 and CCI 250 primers. I loaded up 10 rounds in Federal and Winchester brass. I was very surprised at the difference between the two. The Federal shot 40 fps faster (3070) than the Winchester brass and it shot 2" higher. Both are sub MOA. Ballisticly the 40 fps difference shouldn't make it shoot 2" higher. Has anyone had any similar experiences?